print('введите начальную координату х:')
x = int(input())
print('введите начальную координату y')
y= int(input())
print('введите коофицент увеличения N:')
n= int(input())

coords = [0,0,10,0,10,10,20,10,20,20,0,20]

if n == 0 and x>=0 and x<=500 and y>=0 and y<=500:
    pass
else:
    if n >0 and 0*n+x>0 and 0*n+y>=0 and 20*n+y<=500 and 20*n+x<=500:
        pass
    else:
        if n<0 and 20*n+x>=0 and 20*n+y>=0 and 0*n+x<=500 and 0*n+y<=500:
            pass
        else:
            print('Размер фигуры превышает максимальный размер поля')
            exit()
root = Tk()
root.title("it марафон")
root.geometry("500х500")

canvas = Canvas(bg="white", width=500, height= 500)
canvas.pack(anchor=CENTER, expand=1)

cavas.create_polygon(coords[0] *n+x, coords[1] *n+y,
                    coords[2] *n+x, coords[3] *n+y,
                    coords[4] *n+x, coords[5] *n+y,
                    coords[6] *n+x, coords[7] *n+y,
                    coords[8] *n+x, coords[9] *n+y,
                    coords[10] *n+x, coords[11] *n+y,)
root.mainloop()